help for a noob please?

myself and some friends have started racing online with Race 07 and so far it is a lot of fun.

took me a while to learn how to run a dedicated server and cure the 5000 ping issue, then i learnt how to use all the tracks and skip between them, even got teamspeak working

but one thing i can't work out is this.

first we all start the game and pick our cars etc, we have a race and then i'll change the track but, there doesn't seem to be an option to change cars, are we stuck with the 1st car we pick for the night, or do we need to leave event and join back in?